Pinpoint Test Bi: U351B
WARNING: This page is about a different car, the 2022 Ford Police Interceptor Utility and 2022 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Normal Operation and Fault Conditions
Refer to Electric Powertrain Control - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition SOBDMC U351B:00 High Voltage System Interlock Circuit "D" Low: No Sub Type Information This DTC sets when difference is detected between the battery and the electric AC module. Possible Sources
- Wiring, terminals or connectors
- ACCM
- BI1 REVIEW AND RECORD THE INTERLOCK DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform a CMDTCs self-test.
- Using a diagnostic scan tool, clear all CMDTCs.
- Using a diagnostic scan tool, run the BECM and the Inverter System Controller (ISC) self-test.
Is DTC U351B present?
Yes GO to BI2 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - BI2 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC COMPRESSOR HIGH VOLTAGE CABLE FOR BEING FULLY SEATED
- Ignition OFF.
- Depower the high voltage battery system. Refer to High Voltage System De-energizing .
- Check that the ACCM C1803B is connected and fully seated.
Was the connector connected and fully seated?
Yes GO to BI3 No RECONNECT the connector and verify it is fully seated. CONNECT the service disconnect plug. Operate the system and determine if the concern is still present. - BI3 INSPECT THE ACCM (AIR CONDITIONING CONTROL MODULE) CONNECTOR
- Ignition OFF.
- Disconnect ACCM C1803B .
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
Is a concern present?
Yes INSTALL a new high voltage cable assembly. Refer to High Voltage Battery Cables - Hybrid Electric Vehicle (HEV) . No GO to BI4 - BI4 CHECK FOR CORRECT ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC COMPRESSOR OPERATION
- Ignition OFF.
- Connect ACCM C1803B .
- CONNECT the service disconnect plug. Refer to High Voltage System De-energizing .
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new ACCM and Electric Compressor Assembly. Refer to Heating, Ventilation and Air Conditioning (HVAC) Control Module . No The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.